The cover article below was written by Julie S Copeland of Copeland Research in 2008 and is a synopsis of what political research is and some do's and don'ts to finding and hiring a firm to do opposition research.
Some Do's and Don'ts of Opp Research
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DO start early
DO hire someone who knows politics
DO receive a written report
DON’T have preconceived notions
DO keep a file on yourself and your opponent
DO have one firm do all the work
DO keep the researcher involved